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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b8ef1558061bbbaf60b39eb0a62ddc93cc519cb13f4126898d6207b3a8d09b' 
  AND token = '0AmHuPZcWYWyEpXc7Xj2lamF9WNqSFopRXO/wXjRlm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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