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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a13c611cd35a3414fbed91fccdc3b55e3ee4c5fd7c3d6fb3d551f7c52d7d342' 
  AND token = 'I58PbXG0Q2luC9bTduf4epXJZ5LFUyFCCK4JogHHEuc=' 
  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"
    }
  }
}