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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc2382198a902b3b26cdce99d51546f2ed43c9f42762378bf214c8d37406e392' 
  AND token = 'bKnXQbR+QSo5Ne6xVdDjosKVJ5/f0b3/jtT1NHL/zQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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