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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '804786ad1be0247d82393b23d02dffa6a9d72b77f2e14491e2fc8c3465076d5d' 
  AND token = '1Gg2iH2yT8JUl8YnzgZr0g7coFVzCGQSisLr7qVQ8UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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