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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5e4e8f95f41ab3cf912389753d3a58e7de9e2991b2b05e2f96f2c4c768cdac' 
  AND token = 'x8d7fdJyGHdLZ+ll3/kkz/Gm3nxEaq2DJm2QMLPB0ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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