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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bd66995d8cb8d21eeec9554f2a14e8805b1a9431960e1771c8c6b51e6eada89' 
  AND token = 'tgMxqohKODBpT5p49LHy3+SAbcEfzoRB67SS5YOsZh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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