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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2008a6085741002d605c0b3abf8ac0e6e33766f15e02b426e7ce7c538336082' 
  AND token = 'fqMI+lIA78WRvBTZ9BgvCnk/y23Cn7dSwEouyVmojUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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