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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea89e3d4e9a07dc23d147404d4ee2b48c7df99c88a9ec97d945e6dc36930c748' 
  AND token = 'mDdNTzUlL0DydghIYV94YN+9n/ts/+pznwJt0c+gllQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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