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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc3924d43b06a9ac82bfc9efc01c506c7eaaad307be1848cce0b05251182303' 
  AND token = 'ZLSd2AUN2y9tc0I5F5O0s1ERvT5qfG7aABV9Q6Q5dpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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