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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '458c0186c7b886616ae36ef4d1721aa56db34d5fae9b7548ab65804cd4acb64e' 
  AND token = 'S6HmqYJA/lKnksrDvDoyDsc6MWgrD6+aWwMB2klNzhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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