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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f66de15ab9ba80a2b253f2aea2d0204fd5c961258af7e5581827e109db362c19' 
  AND token = 'br0sHHdpEoev6DizJG49pvj6fdL9RQTk18lf2jMQuPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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