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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345972c6f1c8c7ede55ceafc0d79b0dfd19db34fa17fb543ec2abc7bc94d9814' 
  AND token = 'xEvRDNdooQIZItmKRuIl58brmht9BIbQ7CM9BZZAkOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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