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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5381e1eb4c138363685e4f91ed24c33decb035bec62cf65a2b8e9751a46f70' 
  AND token = 'nVcHDy5irwFs7u57Z8D8Bqnzwa5+bMW0mG07S+l1t3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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