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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3028ed9d5433ba84569ced5a8741d05fea6934dd5700adf4d4c45f2b271411b' 
  AND token = 'rahgm4aDrA3V1g822v7S+1ZypUeKtUyW7s3bnEZo0M8=' 
  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"
    }
  }
}