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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e1e9d0ffbf786d691bf1264b05ce49a0161227c6aac73c81e356251e7cdf66b' 
  AND token = '7+5cxRgWOhNQdAWC2G7Uanz8udN67KhiWh8EDqmmv6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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