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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4634403a1023d27b16ae5c15789f22c1c79bfbef11b4b248a9a20ed6b391e80c' 
  AND token = 'WB3B1Rj1cn17yjdnVu71KgWNRhpJUfGWxBH/Apps6x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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