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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934d1bd1ad3bbf878f86156bd7a74ae3656c6ea61adb86fcae5e15f55a9c0f56' 
  AND token = 'w8f4Ef9R4FLfKonaDDdV3C3PzytbLWJMLeeUOBK/Mj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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