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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb80d17eb1c9a5e06d85718118879ffde83be577e3483c7e8c84acc618f31ce3' 
  AND token = 'D6+XIJbacc+ZGcDL2TJoThsmaKKY9IM6HBRdJYJXpnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}