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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6f4150363d34bd1d633731e5c130d1b58ef9b8765a9a4bd5a18be9b1513de2' 
  AND token = 'CcFdeokvfWfI5zwLKoHxc9lq+mF1cTKqzs5t3peDcU4=' 
  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"
    }
  }
}