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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51af8bc7232b84bc03fa6a9b3742276bf2b0bc5044b77f96c7642e04e7b21b99' 
  AND token = 'SRYDtl/DXrOO2eWUgjpnJvbX/9XWKm4bSyMskiDGh40=' 
  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"
    }
  }
}