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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11a00a6409d35522e9dc1aef65bcb49a3dc19daaf3b0a6e61861524ddb8be5f' 
  AND token = 'YwF1YbNM3bC3Cb8m8flps6Rc9aiPrcyTWcNq9TTWCz4=' 
  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"
    }
  }
}