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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba65988a930dd96e4d99ddad34a8f70db8559f169465947ade7f33cd44b0a3a' 
  AND token = 'MYT0t4diMFswr4xT/NNWJuaA67Bd+hED+UIwblM0+dI=' 
  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"
    }
  }
}