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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f489b03003877010ddbe0fb6fc967e31c53d8b5239510736c1f3788d38851b4b' 
  AND token = 'FfHEQy04vu4CG5TgCUYAFcrf5Gd1foJRaJZYnJDwkYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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