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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6699095448e8cf5a6ada1af161dd351837dc521d7865a44083e0fbb5c295c463' 
  AND token = '3KqXv9MwMjgw9axa4Q3wORBn/UbKaf1i2tHb0fzdC0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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