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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97940dc5df1664091f3c16b91e9d65ce5ae94001aacda28acfdb66815c503bc' 
  AND token = 'yP4QM1LAKdEl/V03I3bX9Ldwa8w+lg51OFwjj0DLEzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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