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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a615b0c93c043546980da4aae50e9ea8178c9306ab1b6b259a0b9f28be00b0' 
  AND token = 'Vru5H5iOMB/7h0IqPZQJY+Awh/23zas7b9pyxLf2ejA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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