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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf64989082c0034f6ce3c1911974664152f4a6856a6357fb53f7ea0000b78d11' 
  AND token = 'O3Yirqtab3d22ukg9Spwsg/4IYivqsjxp7bQIK3heSI=' 
  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"
    }
  }
}