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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96ccc663f30fb10673358866c09c9a3f317cb103e7ef1422467ddbe39f04e52f' 
  AND token = 'paFaoQ/yqtf2vNjZFjpgx2m52SHi2iD1IBf7H7K2oNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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