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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9365f17584636d6a829129dd75b8e1a07da9944ff57403a4111f5025448b44' 
  AND token = 'df//ClOzb/TzFTU4dEPhyk4HzZ4FsvKmUZPE0NEGhb4=' 
  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"
    }
  }
}