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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6e76544f112e25d4cac2bc0ef86a2383b5a255ab86a172e243a71208fd6295' 
  AND token = 'uGM32mLDvNeKZ6spHf50M1IXKqem5tGo6P8HC/Pqt+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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