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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5fb5b66be451c43f0f1c9db67940b52e65f3a68485bacc8aa4f2ceb96184a85' 
  AND token = 'wcy4o4hc/Cm4Luu6J+avScNsmZmMB8BVOZmUHQSbnDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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