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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b8de4c240ce8bdb882c40d7071afbfb572f0406c6a3116696402425ef898f1' 
  AND token = '7OIDoXGwet/G+12b8zpbjMvUjZ02C7Aa+zIXco6lRB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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