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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bad4135e359dfde66e8c037d223c2a7c49c0ef6f5af986ab1842819b0220d3c' 
  AND token = 'Hw7MSgPYVwLOnZEeYQIe2vi/DseBdLr605U0afZCEZg=' 
  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"
    }
  }
}