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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d343215dde33950cbfd37b1822bbdbb544f15d99cc9b61cb95f98c198ce0b21' 
  AND token = '4JCT9VW/68eDeCJLjKlI4EvEXO/e23YP/copM/gT7xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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