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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6acd59aa746395b1a607a56aed6e323af31f6cacfc639ef240abc80f94bc2b2' 
  AND token = 'lrpACbNHSB3g+C90gHfD1vWSE7T3c+d5EST3zmDzsqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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