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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '272c9baa40ca9e5e68b27fa66265263dbdff68df2b47de9e9d90478c8702c163' 
  AND token = 'I522q/hiYja0QrH0MGQ78A0Zl6g8THkqHz4uz6R8+9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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