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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147086d7250fbc57669afdea3c5b68b5aa2a773e97c1bb328585f4c3e5838d6c' 
  AND token = 'MY+/FjEoyoU2Fa2RuGq4dH8aNeYK9f2QIFbsulbfNjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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