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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb0688d8a0730c90092f7975b6c3430996287b1fd541ac8ce77bdda3c1153281' 
  AND token = '+sHjaqLcsIfneR0cUOWJIv2mpsNcqi5JW4pvRlo+UF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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