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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4a3df8adfe8c47337f5a9d2f3f68d89ae4606aec117ada090018062cb1d3b3' 
  AND token = 'h2T26XdKgBqB89J4amgkFBjJ52eKJSYWIk53R1bxpn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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