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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4761f7871cb5517d75cd4ed33680f0955ca72afdb5002a25684d36a12eaec22' 
  AND token = 'mKZwgVAGaB8pcGUC3KcccCRrUP/cl8HSvvYAkx5LQSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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