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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e745618de0a539ef81ce416c1321b083f025342c9381afbadefc2df18dfbe05e' 
  AND token = 'X904D0+QXJUfM1mrFly6H4jyXOBsexXi6LPfa6N9xTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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