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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e00801511e06671ed0d32fa8436115c9c9b009e15d09fb3abec6d3c3b5865cb4' 
  AND token = '8DUTAZW9ethpwT1PqKkG1o1R14R95uGMEmjRpCVDhn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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