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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655fc74bde284f7a1e5923af332c1bc45f8226bcf130aa2791a43db63d9fd16b' 
  AND token = 'wLC9SrMlxbKjB5gXvI/dzk1+LIcKy3H5bcqNciHUDnM=' 
  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"
    }
  }
}