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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14f5548a295d0c00f4547722b9649b3afad06a69c496ffe6354cdf2e8bcc821f' 
  AND token = 'ieyUyLmiAw2aRpWRrVHMztKa6zXiXB2UDQ1AcUQsRJc=' 
  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"
    }
  }
}