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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '568309e3568ad8a0e22453f7c1a17eb573fdbe772a1ad1acfd84a9a5313064b2' 
  AND token = 'g3qTVJmWF/jeWQWPGiM8rVYO23+e33N4O39ZlNepOKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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