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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53c89d25225b7271121306919223071ff9349d51887b4de016ef7e7e67879db' 
  AND token = 'ZDidXyvm1ouFq4Yxi0jZfJQX8jaglM3ndQmQlWeFjOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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