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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d1b118d24bd7e61d748494269b3785ca42bc3c34336c9bf5b9f6018089de12f' 
  AND token = '8485o11XglJ1UB3UeDatrmFCfkDP6XDWh1ZtU7O7rEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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