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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e8f84f99a220aea4b73a243b2255648d86f77356ac552d6034539baf27ec932' 
  AND token = 'bg2Ip0Yir6vmq/Gbogj28Wz7AA0Qwy3JCSpfRzfEI/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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