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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abc28fb8e87ab317d94306cdff1710a57e85666a8b3c8da7a0689bafefa3c47' 
  AND token = 'WPa+Npu22cpjYc0BBIFXphttuMPn9A2AB1nh7ZGH9Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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