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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de95dec81d2beca2b1407eca0f2735f69495d88f93cddce0604b3058b1d79b6' 
  AND token = 'iC33g60mS8zascVjGMifj9tnaIC65Alne6hXD1wSmHc=' 
  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"
    }
  }
}