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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b551224c42be189136a549450173748a550cc34ac20ae13d50ee6c82b8eacb06' 
  AND token = '1Z+OH6FAsKwT0+KYVmEnsRX8bKIm8Sx1bWMOm67PRfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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