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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2a0d5a72c114e3154f031b1c634c37a142c1ddf0c1974da782323a21600e77e' 
  AND token = '6goIifPXe6qpLrYr5rDTAWdYuIX1N97T9ES3WtkZvQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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