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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0237a413a5ec1a2ff9b910b0f8a6fe4d232fff78f0cd209d66b4f4b4a7ae63fa' 
  AND token = 'lwRo4PkcFca6nOcoh0/6Zgh8yTIy9oSBf3QA4xBXcqI=' 
  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"
    }
  }
}