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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9929772195c57f2393bdf2ea0c84e540b67df5fef6f98959fe3f3cc29cbe5d82' 
  AND token = '1WmuXMzgum0dHYQIawTh4Ir525N2/bq/nmgLi/hCM10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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