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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cb40f4592414addd91e5501ffe54c0cbc5e8360b5015110147c58bca5cce94' 
  AND token = 'XY8jYHKN79k5QLJi7uMQ9m+40gHfNh4O+772DvKESWs=' 
  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"
    }
  }
}