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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e6481d10ad6ace53f0f58614a44c66a77bf8c3f37eb9539284d8d118a75a76c' 
  AND token = 'TSlNw+fhsJjsBMKeA5j1FbqreBZOXkaEnOuJcjYBCH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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