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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b83f8be0cb859ffb13f9fbcea35a8f411e1c666852202c5e13fedfcec89416f' 
  AND token = 'IJ6a+x1hz1HWEYaZphxOoqnFvI1pL/JfK8wutBM9TbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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