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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634389a9b0046ab3d7c474eed5941bacd8e4f0e27c16acc61f70f9f6b95e83cf' 
  AND token = 'wbz02G8MiQgL+3MWA82dsqP99eOG6/KHUT0xYqcShYw=' 
  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"
    }
  }
}